1986 Casita Construction - Fiberglass RV
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Old 08-21-2023, 07:20 PM   #1
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Name: Mike
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1986 Casita Construction

I recently bought a gutted 16 ft Casita. Some of the guts cam with it, but it looks like some are missing. There are a couple of soft spots in the floor. I am contemplating replacing the subfloor and was wondering how it was put together. Just wondering if someone can verify what I think I see. It looks like the underside on the trailer frame is part of the bottom shell mold and the wood floor is installed from the inside and then covered with fiberglass. Am I right on this? Thanks in advance.
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Old 08-22-2023, 05:24 AM   #2
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A previous owner of my 69 Casita had tried to beef the floor up with 1/4 inch plywood but this helped a little but springyness was still there so I took this up then cut out the, what I think was original OSB board under it to the fiberglass shell, useing a plunge cutter being careful not to cut the fiberglass. Replaced with marine grad plywood 3/4 inch.
no problems now.
oh I then covered this plywood with those interlocking foam mats you can by at Wal*Mart. a gray color not all those flashy colors.
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Old 08-22-2023, 05:53 AM   #3
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Originally Posted by Gerry View Post
A previous owner of my 69 Casita had tried to beef the floor up with 1/4 inch plywood but this helped a little but springyness was still there so I took this up then cut out the, what I think was original OSB board under it to the fiberglass shell, useing a plunge cutter being careful not to cut the fiberglass. Replaced with marine grad plywood 3/4 inch.
no problems now.
oh I then covered this plywood with those interlocking foam mats you can by at Wal*Mart. a gray color not all those flashy colors.
Gerry, what is a plunge cutter, is it the same as a router. An easy way to cut this floor would be nice.
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Old 08-22-2023, 06:00 AM   #4
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Gerry, what is a plunge cutter, is it the same as a router. An easy way to cut this floor would be nice.
I first fond a spot where I could rip up a little hole in the floor just enough to see the fiberglass bottom... I don't think Plunge cutter is the proper name for this tool but it has a square blade that you can change and it vibrates back and forth... you sometimes see them in INFO-Mercials. I got mine at Harbor Freight. you can cut right into wood by just pushing it straight in but in this case I carefully put it on and angle with the tip just touching the fiberglass and then pushed it along cutting just the wood.
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Old 08-22-2023, 06:36 AM   #5
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I don't think Plunge cutter is the proper name for this tool but it has a square blade that you can change and it vibrates back and forth.
Oscillating Multi-Tool
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Old 08-22-2023, 07:16 AM   #6
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You could use a regular router with a straight bit set just slightly less than the thickness of the wood. Rout across to waste out the wood.

Rout out a checkerboard shape and then use hammer and chisel to pry out chunks. Clean up with a belt sander.
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Old 08-22-2023, 10:40 AM   #7
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Thanks Gerry, I will check them out.
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Old 08-23-2023, 04:56 AM   #8
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Oscillating Multi-Tool
Thanks Donna that's to tool I used and in my old age couldn't think of the name
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Old 08-23-2023, 10:16 AM   #9
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It is bad when my short term memory loss crosses the line of the long term memory loss.... There is a name for this, but I forget what it is.
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Old 08-23-2023, 10:45 AM   #10
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Memory loss nexus?
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Old 08-23-2023, 04:00 PM   #11
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I just have too many darn tools!!!
The thingy and the who dingy or the wacha-ma=call-it.
they all do the job!
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Old 08-26-2023, 11:49 AM   #12
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I think the casita wood is encased in fiberglass. Are you sure you arenít feeling loose linoleum?
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Old 08-26-2023, 12:12 PM   #13
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Scroll saw .
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Old 08-26-2023, 12:47 PM   #14
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problem with using a router in this application, you won't be able to get closer to the outside wall than the radius of the router plate.
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Old 08-26-2023, 03:46 PM   #15
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Oscillating Multi-Tool

Everywhere I have dealt with the subject these are called vibro saws or oscillating saws. I can't image doing much in the way of repairs without one.
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Old 08-26-2023, 05:08 PM   #16
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John, hard to tell. It looks like it was coated with Rhino liner at some point. I may have to do some exploritory surgery at some point. I am just removing the last remnants of the interior at this point.
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Old 08-26-2023, 05:11 PM   #17
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I think the casita wood is encased in fiberglass. Are you sure you arenít feeling loose linoleum?
Not really sure, I think I am going to remove juast a little bit and see if I can tell what is going on with the floor. There is some truck bed liner type couting on the top layer
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Old 08-26-2023, 05:13 PM   #18
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Everywhere I have dealt with the subject these are called vibro saws or oscillating saws. I can't image doing much in the way of repairs without one.
Guess what I just bought! Found a Craftsman version at a yard sale with all kinds of blades. Looks like a handy little tool.
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Old 08-26-2023, 05:18 PM   #19
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I think the casita wood is encased in fiberglass. Are you sure you arenít feeling loose linoleum?
Steve, I am thinking from your description that it is not possible to replace all the floor without taking the shell off the trailer. I am puzzling over how I would approach removing the shell from the trailer if needed.
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Old 08-26-2023, 05:59 PM   #20
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Guess what I just bought! Found a Craftsman version at a yard sale with all kinds of blades. Looks like a handy little tool.

One thing I did was take mine to a real hardware store and got a t handled allen wrench for changing blades. Basically it has the right sized allen wrench sticking down from the handle to make a T. Then another of the same size sticking out of one end of the handle. It makes changing the blades a lot faster and makes it work better once they are changed as it is properly tightened.
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